Vintage Components - Simplex SLJ front derailleurs (out of stock)

On this page: We are currently sold out of Simplex SLJ front derailleurs.

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Simplex founder Lucien Juy owned a bike shop in Dijon, France, when he began making his first derailleurs in 1928. His innovative designs were a hit and by 1933, Juy said he was making 40,000 derailleurs a year.

It wasn't until 1961 that Simplex adopted the deforming parallelogram that Campagnolo had popularized with its ground-breaking Grand Sport derailleur a decade before. But Juy's Simplex derailleurs had a sprung top pivot, the way all derailleurs are made today. At the time, that Simplex Export 61 was probably the best-shifting changer made.

A year later Juy decided to make Simplex derailleurs out of an acetal resin (OK, plastic) made by Dupont called "Delrin". It was a terrible mistake. Juy took what was the best derailleur in the world and turned it into a flimsy, delicate changer.

In the early 1970s Juy again began producing superb changers when he came out with the alloy Super LJ series. They were nicely finished, well-designed, good shifting derailleurs.

No amount of innovation or quality improvement could stem the Asian onslaught, exacerbated by association with those delrin derailleurs that came on so many bike-boom bikes. Simplex ceased production in the 1990s.

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